/**
 *  echarts tooltip 自动轮播
 *  @author liuwei
 *  @param myChart  //初始化echarts的实例
 *  @param option   //指定图表的配置项和数据
 *  @param num      //类目数量(原因：循环时达到最大值后，使其从头开始循环)
 *  @param time     //轮播间隔时长
 */
 export function autoHover(myChart, option, num, time) {
    var defaultData = { //设置默认值
      time: 2000,
      num: 0
    };
    if (!time) {
      time = defaultData.time;
    }
    if (!num) {
      num = defaultData.num;
    }
  
    var count = 0;
    var timeTicket = null;
    timeTicket && clearInterval(timeTicket);
    timeTicket = setInterval(function () {
      myChart.dispatchAction({
        type: "downplay",
        seriesIndex: 0 ,//serieIndex的索引值   可以触发多个
        dataIndex: count
      });
         count =count  % num;//增加
      myChart.dispatchAction({
        type: "highlight",
        seriesIndex: 0,
        dataIndex: count
      });
      myChart.dispatchAction({
        type: "showTip",
        seriesIndex: 0,
        dataIndex: count
      });
      count++;
      if (count >= num) {
        count = 0
      }
    }, time);
    myChart.on("mouseover", function (params) {
      clearInterval(timeTicket);
      myChart.dispatchAction({
        type: "downplay",
        seriesIndex: 0
      });
      myChart.dispatchAction({
        type: "highlight",
        seriesIndex: 0,
        dataIndex: params.dataIndex
      });
      myChart.dispatchAction({
        type: "showTip",
        seriesIndex: 0,
        dataIndex: params.dataIndex
      });
    });
  
    myChart.on("mouseout", function () {
      timeTicket && clearInterval(timeTicket);
      timeTicket = setInterval(function () {
        myChart.dispatchAction({
          type: "downplay",
          seriesIndex: 0 //serieIndex的索引值   可以触发多个
        });
        myChart.dispatchAction({
          type: "highlight",
          seriesIndex: 0,
          dataIndex: count
        });
        myChart.dispatchAction({
          type: "showTip",
          seriesIndex: 0,
          dataIndex: count
        });
        count++;
        if (count >= 17) {
          count = 0
        }
      }, 3000);
    });
  }
